Watch strap buckle



FIG. 1 is a front perspective view of a watch strap buckle showing the new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is an enlarged perspective view of a portion marked 9 in “FIG. 4”;

FIG. 10 is an enlarged perspective view of a portion marked 10 in “FIG. 5”; and,

FIG. 11 is an enlarged perspective view of a portion marked 11 in “FIG. 6”. 

CLAIM The ornamental design for a watch strap buckle, as shown and described. 